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Finding the Fourth Proportional to 287.71, 431.82 and 189.94

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Solution

The fourth proportional to 287.71, 431.82 and 189.94 is: 285.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.71 : 431.82 = 189.94 : x
  2. Step 2: Convert to fraction form
    287.71/431.82 = 189.94/x
  3. Step 3: Cross multiply
    287.71x = 431.82 × 189.94
  4. Step 4: Simplify right side
    287.71x = 82,017.73
  5. Step 5: Solve for x
    x = 82,017.73/287.71
  6. Step 6: Final answer
    x = 285.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.